The main screen of IAmHere allows you to update two default parameters, the default email address, and the default note:

Default email address
If there is an entry for this item, when constructing the email, IAmHere will use this as the recipient. This is remembered by IAmHere, so, if you want to send several messages to the same person, it will be quicker to enter their email address here.
Touching the detail button next to the place for displaying the address will open a dialogue for you to modify this field.
Default note
If there is an entry here, when constructing the email, IAmHere will substitute any "<note>" text in the template with this entry's contents. This is remembered by IAmHere, so allows you to easily add a quick note to send along with your location.

