how to mine this coin ?

If you're wanting to use my pool (https://saltpool.net) then you can follow these instructions:
1) Download and install the wallet (link above in the official announcement)
2) Download your mining software:
- NVIDIA - https://miner.saltpool.net/generate.php?c=News24&a=xevan&s=NEWS&g=NVIDIA&p=3739
- AMD - https://miner.saltpool.net/generate.php?c=News24&a=xevan&s=NEWS&g=AMD&p=3739
This will create a custom miner software package just for you - you will need to enter your wallet address from the wallet that you installed in step 1
3) Launch the start.bat inside the miner software zip that you downloaded in step 2 above

Join the Saltpool discord (https://discord.gg/FQ5cph5) if you want further help mining at Saltpool.net.

All the best!