How do I setup my g-mail

See the following to setup Mail on an iPhone: Add an email account - Apple Support

and on a Mac computer: Add email accounts in Mail on Mac - Apple Support

Another option on an iPhone is to use the Gmail app. Go to the App Store and search for "Gmail" then select the search result with the title "Gmail - Email by Google."

There is no Gmail app from Google for Macs but you can use an internet browser and go to mail.google.com.

Hey there atilano275,

We'd like to help! You may need to contact Google and/or AOL Support about any issues with accounts you have with them. Regarding the issue with receiving mail on your iPhone, this article shows what to do next: If you can't receive email on your iPhone, iPad, or iPod touch

Cheers!