You need to use the field.
Lets say you are trying to isolate your search results to only words starting with “A”, you would enter your rack letters and in the you would enter A and put a checkmark on the left side of the form (which signifies prefix or “words starting with”).
In the same way you can put a checkmark on the right side of the form, which will find you the words that end with “A”.
It will look like this:
If you don’t put a checkmark on either left or right side of the MATCH THIS form, it will show you only words that contain “A” anywhere in the result.
Alternatively, if you would like to see a list all Scrabble Words that start, end, or contain a certain letter you can access that feature from the homepage. See below: