How to Use Parallel Space
Once you install Parallel Space, it will automatically add Facebook+ and Instagram+ icon in the app drawer along with the Parallel Space app. This app is like a sandbox where you run all the other apps and just as you launch Faecbook+ or Instagram+ it will ask you to configure a new account. Just think of it as running a browser as a different user and both the app will work in parallel space.
After you launch the app, you will see a grid with some default apps. To add a new one, tap on the plus icon at the bottom of the page and you will see a list of all the apps installed on your phone. Just select the one you wish to add and then let the app do its magic.
The app will be added to the Parallel Space, and you will be able to configure as a newly installed app. I tried WhatsApp, Uber, Facebook, Messenger and every one of them worked like a charm. There is no limitation on the number of apps you can run in parallel space, and every app will keep on stacking up in the grid.