Thanks for your question.

You can join @upvu service by delegating Steem Power or sending STEEM to @upvu account.

Case : Delegation Steem Power

From the day after the delegation, upvu will upvote once a day according to the ratio. In the addtion you will be received rewards 7 days after delegation.

Case : Steem transmission

You can receive UPVU tokens within 5 minutes when sending Steem. UPVU has the same effect as 1STEEM POWER(voting and reward as well).
If you send UPVU to @upvu, it will be refunded to STEEM in 1:1 ratio in between 1~4weeks.

Thanks.