Hello candy -
we have no integrations with Optiseller and there are no tools available on our end to pull data from their tool into our listing creation page, so it would depend on you retrieving data if you intended to use the tool while creating listings, but you should be able to use the data from the tool to update your listings as needed - either revising your Active listings from the Active Listings page or using the data to update your Saved Listings for the next time you post.
However, we already have a similar tool within Auctiva that you can use on your listings and make updates as needed. Our Pro and Elite plans include the use of our Search Engine Optimization tool which will assist you with the same type of information for your listings.
If you have questions about using our Search Engine Optimization tool, please feel free to file a support case from under the Help tab of the site or using the Support icon in the lower right of most of the site pages.