1. Create account.
2. Download a miner.
3. Configure your miner.
If your using Linux, build from source then type the following into the console:
./xptminer -o mine.ublock.it:5000 -t 4 -u username.worker1 -p workerpass
If you want to mine on a Windows Operating System, then you'll need to modify the batch file included with the download to start your miner.
4. Create a riecoin address to receive payments.
Generate a new address and input it on your account page to receive payments.