step 1: download toomanyitems.
step 2: go to search and type in %appdata%
step 3: click on roaming
step 4: go to .minecraft
step 5: go to bin
step 6: open minecraft.jar with winrar
step 7: unarchive toomanyitems
step 8:open toomanyitems folder
step 9: move all contents into minecraft.jar
step 10:delete META-INF
step 11: enjoy