Select the object using the Selection tool
Set interior and outline color using Fill and Stroke
The Fill and Stroke tool lets you add colors, patterns, or gradients inside an object or on its outline.
Select the object using the Selection toolor the Direct Selection tool .
Click the Fill and Stroke toolin the toolbar, the Properties panel, the Control panel or the Color panel.
Double-click Fill for object fill and Stroke for outline. Once you select a color from the Color panel at display, it will automatically get applied on the selected object.