You can screenshot a picture. That you will find in your image gallery, you can then crop and post as normal. Or You can download a app which lets you repost the pictures you want to. One problem with this is that it will say instarepost at the bottom of the pictures you repost The app's name is insta repost.
bulletin board
The Bulletin ended in 2008.
The Bulletin was created in 1880.
Yes, it is a good idea to use repost for instagram app
The Morning Bulletin was created in 1861.
The Bulletin - Pittsburgh - was created in 1975.
The Biological Bulletin was created in 1897.
Brownwood Bulletin was created in 1880.
Schizophrenia Bulletin was created in 1969.
Edmonton Bulletin was created in 1880.
Edmonton Bulletin ended in 1951.