Use these Powerpoints as ongoing practice to build up instant recognition of these key sounds. You can also print the slides and place them in a binder, I have found using plastic sleeves is an effective way in which to organize sheets.
Use the Powerpoint and/or your binder as part of whole class practice, when working with small groups of children or individual children. These resources are most effective when your are teaching these sounds as part of integrated approach to teaching literacy. It serves as a way to build awareness in children of the key phonemes. After a while they will start noticing these in their books and it will help with developing better strategies for spelling.
The key to making this an effective resource is using in at 'teachable moments'.