If you log in using Leofinance.io, anything you post using that interface automatically posts to the LEO community. For others, there is a communities tab in Peakd which enables you to access them. No new sign required.

Using the LEO interface will get you some upvotes in the LEO token This could help you grow your LEO account.

As you can see with my comments, they reflect being posted in Leofinance.