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Hi, thanks for considering growing your delegation !
This is due to how delegations work. I guess you wanted to "add" 100 SP. But in fact you must "update" the amount of SP you want to delegate. So you have to put 200 in the field !

Let me hope if I put 200, that does not add up to 300 hehehehe,clarify

Be sure it won't.

New error, that my account does not have enough Mana!!!!
Let me try it tomorrow then...

@jaraumoses , I think the problem may be not in lack of MANA. You probably can not re-delagate your received delegations (which belongs to @bramd )
You own only 1354.28 SP as your personal, from which 401.48 has been already delegated, and 915.75 is assigned for power-down withdrawal. So the very maximum you can put now in a new delegation is only 37.05 SP .
1354.28 -401.48 -915.75 = 37.05 SP Maximum

Solution : wait few days, until 2018-12-10, 14:26, when the new withdraw takes place, temporary STOP power down, and then you will have 882.36 free SP for delegations.
Once new delegation is done, you can start again the new power-down

I home this is the reason of errors

Even now, I've not figured out quite how that works.

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