You can go to the Duolingo site using your phone browser: https://duolingo.com You'll need to log in the first time. When you open a lesson on the tree, you'll see a Tips choice as well as the Practice choice.
IMO the Duolingo site makes the tips a lot easier to copy into a notes file or print out than the excessively formatted duome.eu site.
It can often be difficult to relate what it says in the notes to what you see here, so you are not alone in being confused by these things - it is a combination of three things that are each mentioned in the notes:
- Làmh is feminine singular
- That causes lenition of the following adjective
- Lenition is shown by inserting the h and the pronunciation changes.
This may seem horrendous but you will quickly get used to it. After that the logic will soon be reversed to
- There's an h
- So lenition has occurred
- So làmh is feminine (make mental note)
Eventually this will become automatic and you will learn the genders without even noticing.