To insert Runes into your gear, you must first go to the Rune Master. After that you must make sure the Rune is the same shape as the Rune slot in the equipment.
When you go to the Rune Master, you will get this menu shown above. Drag the equipment with the slots into the area where the green arrow is pointing.
After the item has been placed, you will go into a new menu, where you will be able to place the Rune in to the appropriate Socket.
Once it is placed you can hit insert, if you want to upgrade the Rune in the item you can also tap on the Rune here.
You can also upgrade your Runes and the Rune Master as well. You can upgrade Runes whether they are Socketed into equipment or not.
To upgrade a Rune, you can drag it into the ‘’Upgrade Runes’’ slot and it will bring you to the upgrade page. If the Rune is already Socketed to equipment you can also tap the Socketed Rune and it will bring you to the upgrade page.
1 - Once the Rune is placed to be upgraded you need to put other Runes or Flawed Runes as fodder in order to upgrade the original Rune.
2 – You will see the bar fill when you use other Runes as fodder. Once this bar is full you can upgrade it to the next Evolution.
3 – This is your Evolution star for the Rune, each time you fill the bar up, you can upgrade the Rune to the next upgrade level.