If you have a deposit (you sent SBD to @tipu without memo or memo: deposit) you can:
- send tips with tip! anywhere in the comment ;)
- withdraw
There are more options, you can check guides on @tipu blog.
As for investing (sending STEEM/SBS with memo: invest) or delegating SP - there are no commands here and you can invest as much as you want :) if you want to withdraw the investment, let me know in the comments :)