Take a bite of humble pie and ask a gunsmith for help.
How do you put WHAT. A pellets in the rifle, a BB in the rifle, Put it back together. your question is incomplete.
Gun shop or gunsmith
Go to www.crosman.com and click on "Download a manual" you will find you rifle there. It will give you an exploded view of the rifle.
See the link below for the parts diagram.
The JC Higgins Model 21 is a pump shotgun, not a rifle. Reassembly should be done by a competent gunsmith.
first of all it's best to determine the model number. Crosman has most of there manuals, both "Owners and Parts" manuals available to the public. You can post the question with the model number here or look up the parts manual at the link below. The parts manual will help you put the rifle back together..
how do you put a .38 special back together
You need the services of a gunsmith.
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The only Winchester made lever action rifle was the model 88.I would refer you to a good gunsmith to put your model 88 lever action rifle back together again,as these rifles are complex and should not be attempted by a novice.
This rifle was made for Sears using the Ted Williams brand name. It was made by Crosman and is really the Crosman model 160. It was made from 1962 -1971. See the link below for the parts diagram.