Q: Can't change my security questions or answers

Just what difficulty are you having?

What happens when you try to change them?

This may help:

About Apple ID security questions - Apple Support

hi i forgotton my security questions and have lost my phone what can i do to change my questions so no one can hack into it

You need to contact Apple using one of the method here:

https://support.apple.com/en-us/HT201485

I'm trying to reset my security questions for my iPhone and it's not letting me

What do you mean 'it's not letting me' ? If you mean that you aren't getting the reset link on the account on http://appleid.apple.com then that means that you don't have a verified rescue email address on it, you will have to contact Support in the country where you are (and which is therefore the country on your account) to get the questions reset - use the 'If you can't reset your security questions' instructions on the link in lllaass's post above.

too many attemps