if you mean a black screen then it means the too many items you downloaded dose not support the version of minecraft you have the 1.9 too many items
you cant
the mods overlap one another .
if you mean little numbers as in single player comands to get wool you cant you need to many items
Minecraft has alot of cheat codes. But the easiest way is downloading too many items or going to creative mode by using the command /gamemode c. but in a multiplayer server you might have to download a hacked client.
You are unable to download Minecraft for free unless you download it by pirating it which may be illegal in your country. However, you may purchase this product at minecraft.net for quite a good price. More information can be found on their website!
Yes, too many items is free :)
You can find it on the Minecraft forums.
Not including potions, there are 300 items and blocks if it isn't modded.
I assume you mean allowing the items to show up in Too Many Items. I believe there is some kind of config item in the .minecraft folder.
If you can play Minecraft then you can install the Too Many Items mod.
TMI/NEI (Not Enough Items) (Too many Items)