OK great! I normally use the guide here:
First thing let's make a backup of your dnscrypt-proxy2.toml file.
cd /etc/dnscrypt-proxy2
cp dnscrypt-proxy.toml dnscrypt-proxy.toml.backup
If you ever need to recover after editing your dnscrypt-proxy.toml file, use this to restore from backup and restart dnscrypt-proxy:
cd /etc/dnscrypt-proxy2
cp dnscrypt-proxy.toml.backup dnscrypt-proxy.toml
/etc/init.d/dnscrypt-proxy restart
After you have backed up your configuration, you can run though the "Recommended tweaks" section at the link I shared above. Take it one step at a time, and if anything stops working, worst case you can revert your dnscrypt-proxy.toml file using the steps above start new again.
When you have finished applying the "Recommended tweaks" that you want and ensure everything is working properly, you can move on to "Making things go fast" if you wish. Nothing is required in this section if you wish to skip it.
Please reply if you get stuck.