You can change the content of your form request letters by clicking on My Account and choosing "Configure Informant Messages".
You may choose from the default templates in the left-hand column:

From here, you will be able to add new letters by clicking "New", or you can edit the existing letters by clicking on them and selecting "Edit".
Please Note: If you remove the words starting with "#", it will not auto-populate that information. For example, #Informant_Name# will automatically bring the informant's name over to the request letter.