There is no button that would act as F1 or F2. You need to plug in a USB keyboard before turning on the tablet and press F2 (F1 would take you a setup menu that may be confusing...). You will need to do this every time, until you replace the battery (see the picture in the Technical Support Photos folder on the first page of Photos). The keyboard will be needed one more time, right after you replaced the battery.
Please remember to reset the date/time in Interface Setup/Test every time you had to start the tablet with the snapshot button or the F2 key. This will help us to analyze the logs.
If you have a BasiQ tablet, pressing the IQ button on the front should allow it to boot up. If you continue to get the message on a BasiQ tablet, the coin battery may need to be changed. For BasiQ tablets, they must be sent back to us for the change-out. This is a free service. Please contact us through Support for information on sending your tablet.