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Click the Zoom tools to make the live image bigger or smaller. Set the exposure by typing a value in the field. Change the binning when necessary. There may also be a gain control. You can click the Auto button next to the live image contrast histogram to auto-contrast the image once, or you can tick Autostretch to have auto contrast on constantly.
The best way to acquire images is click the Album button at the bottom of the live image window. This creates a new window containing the image you just captured. As you keep clicking the Album button the images are added to the Album window and can be saved either as a stack or individual TIFF files by clicking the disc icon.