You will tell if you see a big button called Mods, and you will see something on the right called Minecraft Forge - (number here) mods loadedand e.t.c
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Minecraft forge is a free program.
First, you google "minecraft forge minecraft forum". And click the first suggestion. Then the first minecraft forum member has posted a minecraft forge link to go to the website.
Minecraft Forge lists you all mods in minecraft and Forge
No, Minecraft Forge is not illegal! That is why many people still use mods.
If you've created a new profile for Forge, all you need to do is change to your username in the dropdown list.