When you're logged in to your HubSpot portal and you're using HubSpot as CMS you can browse around on your website and easily click the HubSpot icon that appears at the top right corner. This icon gives you a menu with options that makes it easier to maintain your website, for example edit that specific page.
But sometimes this icon doesn't appear becuase of a few reasons and it also depends on which web browser you are using.
Mostly this has to do with security and a few tips to fix this is to change some settings in your browser.
One of the problems is the build-in popup blockers normally hides this icon, so you need to change the settings for this.
In Safari you need to go to the settings (you'll find this in the application main menu), and you go to Integrity and turn off the setting for Website Tracking.
You should also try to go to the settings for your specific website and allow Popups on that domain. You'll find those settings in the main menu and under your domain name (make sure you are browsing your website).
By doing these settings you should then be able to see your HubSpot icon.
Note that these settings vary between web browsers, but the concept is the same.