To connect your computer with the Epson EX3260 projector, you can use an HDMI cable. Simply connect one end of the HDMI cable to the HDMI output port on your computer and the other end to the HDMI input port on the projector. Then, select the HDMI input source on the projector using the remote or on-screen menu. Adjust the display settings on your computer if necessary, and you should see your computer's screen projected onto the projector.