Go to HOME and in the 3rd grouping of commands, chose the icon that looks likes a cross with arrow heads on all 4 ends. Its the MOVE icon. If you click on the drop down menu next to it, you'll see that ROTATE is grouped with it. Its looks like a double arrow in circles with arrow heads on the ends as if rotating counter clockwise.
As @ronlatour says, it is a sub-select tool, under the Move button....other commands are like this, and indicated thus, by the small bown arrow head beside each of them.
NOTE: as with the move tool, etc....there is a button for "Copy" that I think is illuminated "ON" by default, make sure to click to turn that off/on, as required.
....one other way to find the location of tools, is the "Command Finder" found at the lower right of the graphics window, type in "Rotate" here, an then in the matches dialogue, mouse over the listed result[s] and Solid Edge should animate where the tool is located.
Sean Cresswell Design Manager Streetscape Ltd Solid Edge ST10 [MP8] Classic [x2 seats] Windows 10 - Quadro P2000