The only way to add a photo to your profile is through the ME section. If the software doesn't work well, then I recommend reinstalling it through the Play Store, or update it if it's necessary. It's also possible that you phone is to old for the WeChat application even if you managed to install it properly.
Additionally, install Bluestacks on PC, install and login to WeChat and add a photo this way and it will be automatically synchronized on the Android phone.