Mares Nemo Sport - can't change to DIVE SET MODE

[SJ]

I bought a Mares Nemo Sport recently. I read its manual and tried to operated it according to the manual. But I can't to change to the dive set mode by A key although I can change to other modes.
Does anyone explain how to change to the mode?
Thank you in advance.

 

[SJ]

I solved the problem by myself. Pushing B key change to the dive set mode during dive plan mode. It is because I didn't read the manual thoroughly. Sorry.