To add photos to an album:-
1. Go to your Profile page from the sticky menu on the left side of the page.
OR Click on avatar, on the top right corner and choose View profile from the drop down menu.
2. Select the Photos tab.
3. Click on Albums.
4. Click on the album you want to add photos to.
5. Click on Add Photos.
6. Drag a photo or browse for one to upload.