Manual focus is a very good skill if you want to get better in photography. The examples in this video was from Olympus Om-D E-M1 MkII.
The MF Assist can be found in the Custom Menu A in the following Olympus bodies:
Pen E-PL9, Pen E-PL8, Pen-F, E-M5, E-M5 MkII, E-M10, E-M10 MkII, E-M10 MkII, E-M1
In the E-M1 MkII it is in the Custom Menu A3.
Focus peaking settings can be found in the following Olympus bodies:
Custom Menu D: E-M10, E-M10 MkII, E-M5 MkII, E-M1, Pen-F and Pen E-PL8
Custom Menu C1: Pen E-PL9, E-M10MkIII
Custom Menu D3: E-M1 MkII
If you havent seen the previous episodes I recomend you to watch them. The whole Using Olympus playlist can be found here: https://goo.gl/9cPqo1
If you have any questions please ask them in the comments!