Wash your Moodies underwear at a maximum of 40 degrees before wearing them. This activates the absorption in the gusset (compare it to a new towel, which also doesn't absorb well immediately).
Then hang the Moodies underwear to dry (never put them in the dryer).
If this is your first time wearing period underwear, we advise you to wear it on a quiet day at home, so you can get used to it and check if you have chosen the right absorbency.
And if you still find it difficult to make the switch, just start by wearing Moodies underwear at night. No more dirty sheets, and no waste!