Filtering Enabled E to Pick Up? [solved]

NOTE I just realized some one asked a similar question once and the answer was great thank you! Aka you don't have to answer!

I have been making a game lately and have been try to experiment with different ways to bring up a gui and when you press a key "e", that item is destroyed. I tried an invisible ring what when you step in it a gui pops up and you can press e to destroy the item. Then I have to create lots of guis all for the same purpose. Then I realized that you could do radius and have one gui for all. I can find nothing on radius and when in that radius a gui that you can pick up the specific item you are near to. I have never messed with radius before. If someone could help show me where I could start on a script that would be much appreciated. (I can modify script to be filtering enabled.) Sorry for my grammar. Have a nice day.