To give power to your breadboard you need to follow some steps.
Step 1: Go to Tinkercad workarea and select a breadboard from components.
Step 2: Similarly, select a battery from the lists of components. Rotate it according to your breadboard.
Step 3: Select the positive terminal of battery and drag a wire with the help of your mouse, to the positive rail of the breadboard.
Step 4: Select the negative terminal of battery and drag a wire with the help of your mouse, to the negative rail of the breadboard.
Step 5: Change the color of positive terminal wire as red and change the color of negative terminal wire to be black, for easy understanding of connections.
Hence, the power is given to the breadboard. Now you can place components and check their functions.