What we see in your image is an out of focus object (the white moon shape) with the shadow of the secondary mirror (causing the out of focus object to have a crescent moon shape) and the struts (or "spider vanes") that hold the secondary mirror in place (the vertical and horizontal lines).
Focus on the moon and get that focus sharp. Then try looking at stars (they should appear as pin-points) then try Jupiter and Saturn. Don't touch the focus knob, when looking at the planets, since the focus point for the moon, star and planet is the same (they are all at "infinity" as far as focusing is concerned).
Jupiter will be "small" with that telescope. Perhaps much smaller than you expect. Look a tiny circle of light with four dots (the moon) around it. You may see some banding. Saturn is often better looking, as the rings should be clearly visible.
As a_donda suggests, the telescope may benefit from collimation (getting the mirrors and eyepiece perfectly lined up) The manual should have details (if not, search the internet) It's hard to give specific advice. Look through the manual perhaps there's a faceslapper that you're missing, or get a friend to go through it with you (four eyes are better than two). If you got it from a specialist shop, you could try talking to the shop people. You could try the website of the company that made the telescope, they may have a contact number. You could search for a local astronomy club.