Scheduling is very easy.
Step 1: Go to Schedule Live (on the left panel)
Step 2: Connect your Facebook API's and Access tokens
Step 3: Give the campaign name and other basic settings
Step 4: Get the timestamp from http://www.unixtimestamp.com/ ( Reference -> http://prntscr.com/dnpcwi )
Step 5: Put your custom profile picture (Recommended 400*400) and hit Schedule Live
You are done.