#1
im over at a friends and me and him were playing he had his electric drums plugged into my cd input so i could hear his drums aswell as he and i had my guitar in the output (like normal) we were playing and smelled some slight burning now when i plug my guitar in and turn it on nothing happens no sound nothing, it comes on but no sound i think the speak might be blow but is there a quick fix becouse im staying over at his house and we wanna play
#2
Get a new speaker if its blown.

What amp you using?

Also, upon reading that, I looked at your Sig and found it quiet Ironic!
#3
...
I think you're screwed. There's a reason that it's a guitar amp. It's probably dead.
And it's prolly not speaker, it's probably something internal that fried.
What amp was it?
Call me Wes.
Gear:
Fender American Deluxe HSS Strat
Chicago Blues Box Roadhouse
Bad Cat Cougar 5
1957 Gibson GA-5
Ceriatone 18w TMB Combo
Hughes & Kettner Tube Factor
Various Ibanez TS9s
Weber MASS Attenuator
#6
damn that sucks cuz we need to play tonight, my dad has some speakers for light a car but id have to do that when i get home would that work?
#7
Yeah, what False_God said.
Yeah, don't do that again. Tell your friend to get his own amp.

EDIT: I don't think a new speaker will work.
If you smelled something, and you're not getting any sound at all, I would only guess that something internal blew. Not the speaker(s). You can try a speaker swap, but I don't guarantee anything.
Call me Wes.
Gear:
Fender American Deluxe HSS Strat
Chicago Blues Box Roadhouse
Bad Cat Cougar 5
1957 Gibson GA-5
Ceriatone 18w TMB Combo
Hughes & Kettner Tube Factor
Various Ibanez TS9s
Weber MASS Attenuator
#9
-Remove Old Speaker

-Take new speaker, attach it to the cabinet section of your amp (where the old speaker was)

-Connect the speaker the same way that the old speaker was connected.

-Turn on, plug in, try playing.

If that doesn't work. You're screwed to say the least.
Usually you don't want to plug two instruments in an amp which can really only handle one.
Call me Wes.
Gear:
Fender American Deluxe HSS Strat
Chicago Blues Box Roadhouse
Bad Cat Cougar 5
1957 Gibson GA-5
Ceriatone 18w TMB Combo
Hughes & Kettner Tube Factor
Various Ibanez TS9s
Weber MASS Attenuator
#11
Just stop.OBVISOULY you know nothing about amp repair. just get a new amp and like everyone else said DON'T do it again!