I want to give privileges to another user. Is there an easy way to do that?

Yes! This is called “gifting”. There are two ways to go about doing this. The easiest way is to donate through the client so that you receive privileges. (In the Soulseek Qt client, you will only be given this option if you already have privileges). Once you receive the privileges, go to your userlist and right click on the username that you wish to give privileges to. There will be a “gift privileges” option. You can then choose the number of days you wish to give them, and they will receive an announcement in a private message from you telling them that they have received “x” amount days of privileges from you.
If you wish to remain anonymous, you can go to the Paypal website and donate to Soulseek. DO NOT donate through the client, or the privileges will go directly to you. Once you have the Paypal donation page up, put the other person’s username in the appropriate field. They will then receive an announcement from OrtaliGoddessOfPrivileges that they have received privileges, but they will not know who the privileges came from.