In order to run the SEO Writing Assistant, you will need an Semrush account to create an SEO Content Template. With a free account, you can create one template and connect it to your Google Docs. 

Please note: Free users and users with Pro subscription can create a Content Template only once. The Content Marketing toolkit on Semrush (which includes Topic Research, SEO Content Template and SEO Writing Assistant) is fully available with a Guru subscription level or higher. Read more about SEO Writing Assistant limits.

If someone (e.g. your Content Manager) has already connected a document to SEO Content Template, anyone who has access to the document will be able to see the SEO Writing Assistant interface.