Widget for Marketing CRM??

Widget for Marketing CRM??

Hi All,
I saw this very cool marketing Widget, that looks like it will show recently sent emails, SMS, social media, etc. etc. 
I have been struggling to find a report that will show the contacts that I have made (via calls, texts, emails, etc.) and this looks like it might do it.
BUT
I can't figure out how to install it.
I want it on/in my CRM dashboard... but can't figure it out. The directions say to click Setup> Developer Space > Widgets... But no directions as to WHERE Setup is!

Thanks for any help, links, etc!

https://help.zoho.com/portal/en/kb/one/user-guide/widgets/articles/marketing-widgets