Where is the Reset & Send Password option?

In v7.x and earlier, a Reset & Send Password option was located in the Clients Information section of their Summary tab:

v7.x Clients Information

In v8.0 and above, it is now located under the Users tab and accessed by clicking the down arrow next to the Manage User button:

v8.x Users tab

More information on the new functionality on this tab is  published in the documentation.