Does anyone have any tips for playing multiple strings at once on a guitar?

I assume you are asking about 'finger pickin'. It's hard to explain but I'll give it a try. This is called "Drop Thumb" or sometimes called "Travis Picking".

Number your right hand fingers... Thumb = 1... Index finger = 2... Middle finger = 3.
The picking pattern easist to learn is 1,2,1,3.... In the "G" cord, your thumb rocks between the top two strings (5 & 6). Fingers 2 and 3 pick strings 1 & 2 and can change to 3 & 4 as you learn the process. As you gain more confidence, try different strings and patterns.

Good luck in your learning process.

im not exactly sure what ur talking about but i think u need to use the thumb and forfinger...

grow more fingers

Yes, use multiple fingers.

Uhmm.. Im sorry, Id ry and help you out if I knoew what you meant?
You could use clamps or something?

sure go on google type guitars and it will give you 77 pages of that cause i play guitar too

ask ya mate to hold some strings and then go and make a cuppa tea!

why don't you go to a teacher who teaches how to play guitar

use a guitar pick