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@tipu @cardboard after depositing SBD, how do I use it to tip an author or comment (like tipu just did above)

Just write tip with ! anywhere in the comment :)

Will it give them my entire balance or only .1 at a time?

only 0.1 at a time, but you can also write tip ! 0.2 or any other number to set how high the tip should be

Is there a minimum tip? Can I tip .05?

Yep, minimum is 0.1 :)
You can also now send tips like this: @tipu send tip
:)

Hi @omitaylor! You have received 0.3 SBD tip from @cardboard!

You can now delegate SP / invest in @tipU for daily profit:) Click here to learn more :)

Can you tip LESS than .1?
Can you tip MORE than .1 without multiple comments?

Minimal tip is 0.1 :)
Yes you can, just wrtite tip ! 0.5 or any other number
You can also send 5 tips to one person (with 5 different comments).