If you want to assign a specific notary to an order, just create your new order and select Search Agents. From there, find the notary you want to assign in the search results, without starting the Automator. If the notary is already favorited in your account, you will see them at the top of the search results.
When you find the notary you are looking for, select the Assign button next to their name. This will automatically assign them to the order.
If you want to reach out to multiple notaries that meet the signing requirements, follow the steps in this article to search using the Automator.