Sort:  

invest which will be treated as sp delegation.
refundYou can also use @tipU to invest - which works kinda like a investment fund. Just send SBD or STEEM to @tipU with memo: If you want your money back, just send 0.001 SBD to @tipU with memo:

Please feel free to test it, more info should appear below in a moment: @tipu help

The invest guide is outdated though :) the SBD and STEEM that you send are no longer converted to actual STEEM POWER so you can always refund it without need to wait (for power down).

@cardboard is there a maximum to invest?

Yep, currently @tipu has 3k SP to spare which means that max 6k STEEM/SBD can be invested.

Okay! :) and where can I find the overview of how many steem or sbd I have currently invested, if there is an overview? :)

Sure, you can send 0.001 SBD to @tipU with memo: status or write a comment: @tipu status