i have 750 SBD in my blocktrade account, but dont know how to invest it on steemit network!

Am a Newbie here, looking for help on how to use SBDcoins in my wallet! Which i purchase a week ago.
What are the following:

• can i invest it for trading on steemit
• is there a way to use it buy upvote
  or comment
  Thank, for your kind response