If it's an album you created on iPhone, you can tap "select" in the upper right corner, then press on an image to move it. For the albums Apple created, you can create a duplicate album, then move them as you desire.
If it's an album you created on iPhone, you can tap "select" in the upper right corner, then press on an image to move it. For the albums Apple created, you can create a duplicate album, then move them as you desire.