Start with washing your moodies before using them at a maximum of 30 degrees. This is important to activate the absorption in the gusset (compare it with a new towel, which also doesn’t dry well when not washed).
And then hang dry. Do NOT put your moodies in the dryer.
If it is your firts time to wear period underwear we advice you to pick a quit day at home to start using it. You can then accomodate yourself with it and check if you chose the right absorption level.
And if you still find it difficult to change to period underwear, maybe you can start wearing them at night. No more stains in your sheets, and no waste from pads and tampons!