I just installed optifine and i have seen some videos and the have this writing over their screen, how do i get that to come up? And does optifine work on other profiles? And if it does not, how do I install mods? (I use forge for all my mods)
I'm going to assume "writing over the screen" is referring to the debug menu, which can be brought up with F3. Optifine works on whichever profile you install it to assuming you have the correct versions. Lastly, optifine does not change how mods are installed. If forge is installed correctly, you can drop all mods into the mods folder regardless of weather optifine is installed or not.
I made my own shader pack, by the way.