Everyone always talks about a minecraft folder and a mods folder but i dont have that when i downloaded minecraft all i got was the minecraft launcher and will the creators of exsplosives+ pls get it up to date
Have you tried YouTube or the Wiki? In general, you will need to install at least one Mod (Minecraft Forge) to the minecraft.jar, which then allows the easy adding of mods to a "mods" folder, which Forge creates. Also, a better place to ask about Mod updates would be in that Mod's thread.
http://www.minecraftwiki.net/wiki/Tutorials/Installing_Mods