In the Photo app, be in the "Albums" section. Then, press on the album in which you want to put your pictures. At the upper right side, press the curvy arrow. A button will appear (also there on the upper right) titled "Add Photos." Press that button and all the photos in your Photos app will appear. Select the photos you wish by tapping on them (a little blue check mark will appear in the lower right of the photo).
Once you've selected all the photos, then press the blue Done button in the upper right. Ta da! You now have your photos in the new album.
Hope this helps. Let us know how you get on.
Marilyn