Magento

I’m new to blogging commercially using Magento and have not found the software very straightforward.

Principal difficulty has been getting the completed blog to actually post. Every time I click on Save Post I get a request for a valid URL key. Nothing I am trying seems acceptable.

Any suggestions?

I think that you are confused; Magento is an eCommerce solution used for selling products, and not a blogging system.
If you are using one of the blog contributions (e.g. AheadWorks Blog) then you need to pose your question on the appropriate forum.
If your error occurs when trying to create a product in Magento, post the full error and the community can try to help.