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If you want a post to be upvoted, you simply send between 0.01 and 4.5 SBD / STEEM with the link to the post you want upvoted in the memo. You will receive an upvote or a refund within 30 seconds and if that does not happen then something went wrong.
In which case you can send me an email and I will manually refund: strangeh21@protonmail.com

An example to get your post upvoted would be the following:
Let's say we wanted to upvote the following post.
https://steemit.com/landscapephotography/@emiii18/landscapephotography-for-tuesday-contest-isla-catica-venezuela

Then you would send the following payment:
Payment to: upvotewhale
Amount: between 0.01 - 4.5 SBD/STEEM
Memo: https://steemit.com/landscapephotography/@emiii18/landscapephotography-for-tuesday-contest-isla-catica-venezuela

Please note as of right now, I have low voting power. When I have low voting power I refund all transactions until my voting power has recovered.

Ok thanks for the information.. How can I know if their voting power is high? because I'm interested in getting your vote in my last publication

As of right now the only way is either by checking payment history and seeing if I refund every payment with the "Low voting power" message, or by sending me a payment and seeing if it is upvoted or refunded.

In the future I will add features so you can easily tell, but as of right now I am prioritising ironing out bugs, I'd rather have a featureless bot that is guaranteed to work rather than a bot full of features and full of bugs and problems!