The fastest way onto SlickVPN on a Mac is the native client. Here is the quick-start flow.
Launch SlickVPN from Applications. On first run macOS may ask to allow a VPN configuration — click Allow.
Enter your VPN username and password from your welcome email.
Choose a nearby city for the best speed, or a specific country to appear in that region.
Click Connect. The menu-bar icon turns green and your new IP appears in the window.
SLICKVPN
Weston Road PMB #231
Weston, Florida 33331, USA