¿Cómo empezar a resolver cubos?

you should fix that before the last layer unless you are using k4(which I doubt you are) by doing Uw' RUR'FR'F'R Uw for the last 2 piece, but the alg for blind is
l'U2l'U2 F2l'F2 rU2r'U2 l2
which you would setup to with RB and then undo
 
From the position in your image, put red on front and green on right. Then do R B l' U2 l' U2 F2 l' F2 r U2 r' U2 l2 B' R'.

UFr is the right-hand wing piece of the UF "edge".
 
I have no idea what you said ... Idk what UFr , UBr is.

That is the notation blindsolvers can comfortably throw around on our sub-forum. It just describes the position. For UFr means Upper Front right sticker and based on whether something is capitalized or not tells you whether the sticker is on the outside. so UBR is UpperBackRightCorner since everything is on the outside for corners, but ubr would be the upperbackrightcenter.

Anyway, just do RB (the Alg) B'R'
 
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Well I did that, and I messed up my whole cube.. ***

Try to undo what you did and learn the 4x4 notation here
http://worldcubeassociation.org/regulations/

Don't worry about having trouble with the 4x4 parity and notation. At one point, I ran into the same problems and am trying my best to help since notation can be frustrating. The fact that r and Rw mean the same thing on a 3x3 and different things on a 4x4 is almost asking for confusion.
 
if you are unsure what everyone is talking about and you are getting frustrated with notations and such, maybe you should look up a more beginner method for a 4x4. k4 is generally not the method that most beginners start with. look up a reduction method. this would involve 1: solve the centers 2: pair all the edges 3: solve as much as you can as a 3x3 using whatever method you like 4: fix parities and finish solving.

to fix the case that you have in your first post, everyone is presenting you with the proper solution to your problem. you must fix the edge parity. do not worry about preserving your f3l (maybe this is what you think is "screwing up your cube") but, the cube is "unsolvable" until you fix this parity. you could try to rescramble the cube and solve with the same methods, but this might take many scrambles until you run into the case that you do not have a parity.
good luck!
 
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Actually, given that you are a beginner at 4x4, that's quite impressive. That means that you basically thought of K4 (or a slight variant) on your own. *applause*

As to fixing your problem, you need to play with the 4x4 a bit and get a feel for how commutators work. Or you could just spam R U R' U' r U R U' Rw' from different angles until the end :P
 
Here's how you would have paired; from the way you are holding the cube in the photo do R' U R so that the two edge pairs are opposite each other (green-yellow directly opposite the other green-yellow and orange-yellow directly opposite the other orange-yellow). Now turn the cube so that yellow is F and orange is D (basically just x') and do Uw' R U R' x U R' U' R x Uw.
 
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