For both, there are settings that are accessible in your Settings app.
Essentially, they both work the same way. Infiniboard makes it so you can have more than 20 apps/icons per page; with Infinifolders, you can have more than 20 icons per folder.
If I recall correctly (I'm not using them at this time), they install "on" in that they work right away (they may have to be activated in Seetings ... ). So, press and hold an icon until it begins to wiggle and then either put it into a folder or onto a page. Rinse and repeat the process until you have your apps where you want them.
The stock way they both work is they allow for vertical scrolling of a page if you have more than 20 apps per page/folder.
If that's not enough to get you going, please let us know what specifically has you stumped. Else, hope this helps.
Marilyn