I have done this guide as setup for the solo 4k is slightly different, as I found out, hope it helps
This is based on a pia account
login into your pia account, go to downloads and support and download the file openvpn configaration files (recommended default)
1, Install openvpn on your box blue button > network > network services > openvpn
2, Make a folder on your desktop call it openvpn
3, Open the openvpn.zip file that you have just downloaded, from there you need the ca.rsa.crt file (security certificate) and the crl.rsa.pem (pem file) drag these two files into the openvpn folder that you have just created on your desktop
4 Then get any ovpn file drag it to your desktop and edit the line auth-user-pass so it reads auth-user-pass password.txt (dont forget to leave a space after pass and after.txt)
5, Save the file as Client.conf you can now put this file into your openvpn folder
6, Make a password.txt file using notepad and add your username and password that you got from your email so it looks something like this:
p1234567
HW7987654321
7, Save and add it to the the openvpn folder
8, You should now have four files in the openvpn folder, so the folder can now be added to the box root/etc
9, Finally press the green button to start vpn on your box, and hopefully all is good and its working.
It really is that simple