If your AE is up to date and your system meets the minimum system requirements:
Add a text layer.
Find the text presets.
Select the text layer
Drag or double click the selected text preset.
Done....
If that doesn't work then we have to have workflow details down to the last decimal point. A screenshot of the layer you are having problems with with all the modified properties revealed would help. Just select the layer and press the u key twice, then Print Screen and paste to the reply field on this forum. If you are using a Mac the Shift + Ctrl/Cmnd + 3 then drag from the desktop.
Just saying something doesn't work does not give us much to go on.
If you have not done so yet start here: Basic AE
Lots of information here on how to use and create animation presets that can be found by using the Search Help field. I've been using AE for more than 20 years and I use Search Help all the time to see if there is anything new and to remind myself when I'm rusty...
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