Which model? All the different models are assembled differently. Crosman has made over 100 different models over the years.
See the link below for the drawing.
See the Crosman link below.
See the link below for a view of the Crosman 766
How do you put WHAT. A pellets in the rifle, a BB in the rifle, Put it back together. your question is incomplete.
See the link below for the parts diagram.
See the link below for all of Crosmans Owners and parts manuals.
Go to (See the link below) and find your parts and owners manual for your gun or rifle. Crosman keeps a web page for older airguns.
Make sure that you have released the clip on the BB Magazine before you put it back into the gun Also make sure that you put the magazine back in the right direction It will only lock in if it is inserted correctly. You can find the manual and parts diagram on the Crosman web page see the following web page. (See the link below.) If your gun is still under warranty you can contact Crosman Customer Service and ask for assistance. 1-800-7AIRGUN (724-7486)
Gun shop or gunsmith
in the scope its a slide on the top put the scope on the gun aligned with the hole in the gun and scope then pour bbs into the scope
it depends on the model.
Might help if you gave a model number - if it's a Crosman, (see the link below) and download an exploded assembly for the model number. Most are available there.