Find a Beta player and a VHS. It might be difficult to find the Beta player, but it's a necessary part of the process. Check pawn shops, antique stores and rummage sales and you might get lucky.
Purchase a two-sided A/V cord. These are inexpensive, and you can find them at your local electronics store or department store. They have a white plug and a yellow plug on each end.
Connect the two players correctly. Find the outputs on the Beta machine and connect them to the inputs on the VHS player. These will likely be yellow and white plugs on the back of the machines. Correspond the color of the plug on the cord with the color on the back of the machine and simply connect them via the A/V cord.
Connect a coaxial cable from the VHS to your television so you can monitor what you are recording. The coaxial connection is usually located on the back of the VHS; you use the same cord that you use when connecting the cable. It plugs in and then screws in for a better reception. Do the same thing with the other end of the cord on the back of the television.
Test the connection. Put a Beta tape in the Beta player and press "Play" to see if it comes through on the TV screen. If it doesn't show up, check the connections in the back. Make sure they are correct and tight.
Insert a tape in the VHS. If you've tested the connections and the image from the Beta tape is showing up on the TV screen, you can start recording. Start the Beta tape from where you want to begin recording and press "Record" on the VHS.
Stop recording when you're done by pressing "Stop" on both machines. If you only want to record certain parts of the Beta tape, press "Stop" on the VHS when a section begins playing that you don't want to record. If you want to record the entire tape, simply sit back and monitor the TV to ensure everything is working properly.