First of all, let me point out that it is very helpful to check the \"Field Notes\" on the right side of the Edit Field screen - most of the syntax clues I know came from reading that section.
For a select box, the Field Notes says:
Add as Default Value the value|Description of the options separated by coma(,).
Example: value1|Description 1,value2|Description 2,value3|Description 3.
The \"description\" (the part after each | character) is what the user will see as his choices in the drop-down box, and the \"value\" (the part before the | character) will be what is sent for processing, and will be what appear in place of the placeholder {myselectbox} when you put it in the Thank You page, the notification Email, or anywhere else. Typically the descriptions are longer than the values (because the values are usually only used internally by the website administrators), but it doesn't have to be that way.
So for your situation, I was suggesting that the value be what you want to say in the email. Here's the syntax example using the text you asked for, but with extra spaces and carriage returns in it to make it more readable (don't use those when you do it for real - it should be all one line), and I'll add color to show you the different parts - red is the value, blue is the description, and separators are black - the comma between each option and the vertical bar between the value and the description.
Please go back and fill up the missing fields. | ? ,
I wanna work with you | Yes ,
I dont want to work with you | No
Does that help?
You said you don't understand the {field} placeholders either, but I don't know how to explain it any better - in your Thank You page, your Email, or anywhere else like that, if you put the name of one of your fields in curly braces ( like {myfield} ), whatever is the value of that field when the form is submitted will appear in that spot. I don't know the name of your selectbox field, but that's what you would put between the braces.
if \"?\" or \"-\" : Meaning default and not answered, prompt \"Please go back and fill up the missing fields.
Be aware that so far we have only been talking about what goes on the Thank You page or in an email
after the form is submitted. If you want a \"validation\" prompt, in other words, you want RSForm to
not accept the form until Yes or No is selected, that's a different thing. I have never tried to use RSForm's standard validation on a selectbox (only on text fields), but you could try the \"mandatory\" validation setting. Instead of the text \"Please go back...\", put nothing at all before that first vertical bar, which will make the value of that option blank (make sure there are no spaces or anything before the | character). In RSForm's \"Validation\" setting for that field, select \"mandatory\". Once you have selected that, you can edit the validation message if you like. Then apply the changes and try using your form - hopefully if you try to submit the form with the selectbox still at the first option (which would have a value of nothing but a description of \"?\"), RSForm will show you your validation message and send you back to the form. If instead, the form goes through with no protest, next try making both the value and the description blank - the very first character would be the vertical bar and the second would be the comma, like \"
|,I wanna work with you|Yes,I dont want to work with you|No\". If that still doesn't trigger RSForm's validation and stop the form submission, then that type of validation doesn't work on selectboxes and you'd need to do custom validation, which appears to only be offered in RSForm Pro.