1. Go to: 

https://my.workshopsoftware.com.au (AUS & NZ users), 

https://my.workshopsoftwareuk.com/login.html#/login (for EU and UK users) and 

https://my.workshopsoftware.com/login.html#/login (for users from all other countries)

2. Press the star button to the left of the URL and then select "Add bookmark".

3. Give your bookmark a name and leave the folder as "Bookmarks bar".

4. You can now access Workshop Software from the bookmark bar as shown below.