Customise current theme

[Martin_Lanyon]

I'd like to customise the current theme and I'm not getting the option to 'customise current theme' in the Options, Preview features.  The image below provides the options available.

Any suggestions?

[amitchandak · Accepted solution]

@Martin_Lanyon , See if my video on the theme can help

https://www.youtube.com/watch?v=-3qx5a_c_Ew

[Martin_Lanyon]

Thanks for your help.  

Greatly appreciated.