Anybody have idea how to add custom URL to top navigation bar?

As Zoho One user, I have Zoho Sites and Zoho Commerce store (same engine). In Zoho Site I enabled Blog and I want to add it to my Zoho Commerce eStore at the top right side of top navigation bar (next to Sign Up link) and viceversa. In Zoho Site I want to add to top navigation bar on the right my Zoho Commerce eStore URL link.