Add the following lines to your emacs configuration:
(setq wakatime-dashboard-api-key "YOUR-WAKATIME-API-KEY")
(unless (package-installed-p 'wakatime-dashboard)
(package-vc-install
'(wakatime-dashboard
:url "https://github.com/MAlba124/emacs-wakatime-dashboard.git")))
(require 'wakatime-dashboard)
The dashboard can then be opened my running the wakatime-dashboard
command.