Selection Brush Tool - Newbie question

[Wireless]

Hi there. Just bought Affinity Photo.

First challenge was to cut out a section of a photo, so I watched the tutorial at https://vimeo.com/channels/affinityphoto.

Opened up Affinity Photo / opened a photo / selected the Selection Brush - and then NOTHING!

I cannot replicate what I see in the tutorial. The selection brush appears to do nothing. I thought it might be that my photo opens up as a background with a padlock - but the tutorial is the same. I've tried pressing all the extra keys I can think of. I've tried exploring the forum.

HELP PLEASE (It must be me?)

Thanks - Bob

[MEB]

Hi Wireless,
Welcome to Affinity Forums
Make sure the Mode is the context toolbar is set to Add.

[Wireless]

Yes it already is. I saw that in another answer.

I still have the problem of nothing happens.

This is a brand new paid-for installation of Affinity Photo on a Windows 10 fast Desktop PC

[Wireless]

OK - My bad. It does work.

Being new to the application, I mis-read the highlighting. As a default it looks like ADD is already selected. Thanks for your help!

[Old Bruce]

2 hours ago, Wireless said:

... I mis-read the highlighting. As a default it looks like ADD is already selected. 

Done that more than once with many of the tools.