updated custom-add-on

custom-add-ons.md

@@ -26,8 +26,39 @@ https://github.com/element-hq/element-call
 
 https://gitlab.gnome.org/GNOME/gnome-remote-desktop
 
-#### The code will be installed in the `custom.nix` file.
+#### The code will be installed in the `custom.nix` file located at `/etc/nixos/custom.nix` from the initial setup.
 
+If you would like to add in these features your self, then open the *terminal* app and type or paste in
+
+```bash
+ssh root@localhost
+```
+Type in the password in the diaolog box if necessary. It is the same password to run the Sovran_Systems_Updater app.
+
+Then press enter.
+
+Next, type or paste in
+```bash
+nano /etc/nixos/custom.nix
+```
+Then press enter.
+
+Next type or paste the codes below *(Sovran_SystemsOS Features)* in to the termainl/nano window.
+
+Once done, press `ctr s` then `ctr x` to save and exit.
+
+Last, type or paste in
+```bash
+nixos-rebuild switch --impure
+```
+Then press enter.
+
+After it is done bulding, reboot your Sovran Pro typeing or pasting in
+```bash
+reboot
+```
+
+---
 
 1. The code for Bitcoin Core is as follows: