Sign in at top right of screen: https://powerbi.microsoft.com/en-us/
If this is coloured in yellow (same as the try free icon), clients will find it easier. I find it easy personally, but some find navigation more difficult. The Sign in button should stand out more. The picture of a business user thinking is also a little offputting and doesn't give the impression to users that they are about to log in to PowerBI. Even a simple PBI icon would work better.
Also, Personalization of the homepage after log in would be a nice feature.
mattlee
on:
Small multiples not fitting to scale
on:
CMD Prompt Popping Up During Changes