First create a new .do file. The assistant will open, and you first have to select the file to simulate. First you can select the signals and I/Os you want to see after simulation. After that you can select the inputs that you want to simulate and assign values to. Also the time to simulate is needed.
- Select the input
- Select the time units to set a value
- Select the data to set the input to (or press High or Low for '1' and '0')
- For CLK press Low, High and then repeat
- Or press Add for different inputs that shouldn't repeat