You have to reach the minimum payout amount, and wait for the next payout round. Check the Payments page.
Additionally, after finding a block, you have to wait a set amount of time for the pool to confirm that the block is valid. You can check the status of this on the Blocks page.
Wait a few minutes. If it still shows 0 H/s, double check you entered the correct pool address, and username(your uPlexa address).
Pools display an estimated hashrate, while the miner displays your actual hashrate. Earnings are not affected by this.
Keep mining for a few more minutes, and try again. If issue still persists, double check you entered the correct address both on the website and in your miner.