Change colour of object

[Charlotte721]

Affinity newbie here and hoping someone can help please. I've created an outline of a campervan, but I'd love to change the colour from black to blue. Is there a way I can do this or can you not change a background object? There's various objects as my initial selection wasn't perfect so I'd need the right wing mirror and campervan changing. There is also a rectangle under the windscreen which it lets me change the colour on but I can't work out anything further. I'm a Mac user.

Thanks, 
Charlotte 

campervan outline BW.afphoto

[walt.farrell]

Welcome to the Serif Affinity forums, @Charlotte721.

I would probably start by trying the Flood Select Tool to select those pixels, then the Flood Fill Tool to change the color. 

[PixelPest]

Maybe:

1. select Background go Filter->Color->Remove White Paper

2. Take Flood Fill or large brush (enable Protect Alpha) choose color and paint over.

[Gnobelix]

 

 @Charlotte721  welcome to the Serif Affinity forums.

Some suggestions have already been made.
I would do it this way.
Steps:
1. The wing mirrors layer (right) and the Background layer combined into one layer, and rename copy-bachground.
2. Select the layer copy-background , then Filter- Color-Remove White Paper.
3. Click with the left mouse button + CTRL on the Thumbnail (a selection is created.
4. Created a new fill layer.
5. Choose a colour of your choice.
6. Group the  layers copy-background and the new-fill-layer and deselect the selection.

Is a little more elaborate,I hope this helps.

Cheers

campervan outline BW-2.afphoto