How to make a video with parts from other videos and post on instagram?

[delailah]

Like a mixed video if you have instagram you can see some people do it
Not like a regular slow recording video

[Palladini]

You could use Firefox, get a video down-loader add on, then use that to download the videos you need. then download RealPlayer, use that programs conversion tool to convert the file to something you can use. Then using a Video Editing Program, put the file on the timeline, edit out the parts you need, then save that file. Do that to all the source material. When done, import all the videos (this would be easier if you saved the new edited video in a separate folder) and make you flick. Render it out, then upload to instagram. Not that hard to do, just takes up lots of Hard Drive space.

[Tapash]

Try using Magix movie edit pro. It can definitely serve your purpose