The Resources area in ResourceFirst is where resources can be added, deleted/inactivated, maintained, and assigned to work. Resource utilization and capacity can be viewed, as well as a skill analysis of utilization by skill.
To access the Resources area, click the Resources icon (the "people" icon in the upper left tray, highlighted in blue below).
This opens a Resources set of sub-tabs, as illustrated below.
The recommended articles in the Resource Management section of this site explore the tabs in more detail.