Assuming you have the right kind of minecraft launcher, this should take about a few minutes. Log in as usual to your minecraft launcher then follow these steps:
Click on the three bars to the right of the Minecraft logo.
Click on "Launch Options" then click on the "Add new" button.
Name your profile "1.9.2" and select "release 1.9.2" from the drop-down menu and hit "Save".
Click the "X" to the right of the Minecraft logo.
Click on the green rectangle to the right of the green "PLAY" button and select 1.9.2.
Note: Any newer version higher than 1.9.2 or The Latest Version are Not currently compatible. Our servers will get there eventually!
Afterwards, go to the server admin page and try connecting: http://mod.learntomod.com/server_instances/current There will be a Steve tutorial video that will show you how to connect.
Note: If using an older than 1.11 minecraft launcher, here's how to change versions. Press the New Profile button near the Play button, name your profile and select "release 1.9.2" from the dropdown menu. Then press save.
If these instructions don't appear to work, then that means you have an incompatible minecraft launcher. Where can I download Minecraft?