It seems you are using Standard edition of TemplateToaster. Please check our purchase page for the feature comparisons between Standard and Professional Edition. Please use Professional Edition of TemplateToaster, You can switch edition from TemplateToaster settings menu.
Please Go to TemplateToaster -> File -> Settings -> Edition -> Select Professional Edition from drop down.
After that to change the Menu logo navigation link Go to TemplateToaster -> Menu -> Click on Menu logo -> Format Tab -> Add/Edit Link -> More Options popup is opened -> either set the Internal/External URL or select No link and save changes.