This is how to mine at the arhash.xyz pool (also xmr.pool.allripped.net & arhash.allripped.net) with the Minergate GUI miner (as they only alow cryptonote coins to work with this, it will work for arhash pool too).
If you followed this <a href="index.php?topic=83625.0">[GUIDE] Minergate Mining[/url], and got your minergate already to mine and you want to mine the arhash pool then goto View > Show other pools, like so:

That will show the "Other Pools" tab and the top, click on it, then you need input this info into the fields below:
Display Name: | ARHash |
Pool URL: | xmr.pool.allripped.net:3333 |
Pool Login: | YOUR_MONERO_WALLET_ADDRESS |
so everything looks something like this:

now click the "Add pool" button on the end, you should be looking at something like this:

And you are all done.
Happy Mining & Good Luck!