How do I allow users to send me emails?

The way you are building the s string is wrong. If you want to add 3 parameters, you should do it like this:

Set s to web_app_url
Set s to s & "?email=" & URLEncode(EnterEmail.Text)
Set s to s & "&full_name=" & URLEncode(EnterName.Text)
Set s to s & "&message=" & URLEncode(EnterMessage.Text)

https://script.google.com/macros/s/alsdjalksdjaldskjaldskjaldskjalsdkslkdj/exec?email=abc%40gmail.com&full_name=John%20Doe&Message=bla%20bla%20bla

Okay; thanks, a lot. You've been a huge help... I'll make the changes, and see how it goes.

Hey dop2000, I tried what you said, and it worked; but there is still one tiny problem... It says there's a problem in the gs code line 41. It has to do with the Time. The Date is working fine as well, but the Time isn't.

I clicked on the full "Exact Time" column, then clicked on "Format -> Number -> Time, like you said, but there's still seems to be something wrong with the code (it would appear that I can't just change 'Date' to 'Time' -- that's what I did to line 41).

What do I need to change about line 41?

dropbox.com/s/cqg3ctmy2doyk0w/lastquestion.JPG

I think you need to use Date for both columns, and then set different cell format in the spreadsheet.

Yep; that was the problem.

Thanks again, dop2000.

Hey guannstar I just now noticed this thread. Sorry I didn't reply sooner!

Ultimately, it looks like you got all the help you possibly could have asked for haha. I don't think I could add anything that the other lovely people in this thread have posted.

Cheers.