l did to hole a button in first before l enter the code???

You should be able to find the code in ur handbook/documentation.

To enter the first digit u press button 1 until u get to the number u want

To enter the second digit u press button 2 until u get to the number u want

Repeat for all for digits, wait & then it should store by pressing & holding 6

e.g if ur code is 1234 then using the buttons on the front of the radio press 1 once 2 twice 3 three times 4 four times & then press & hold six.

Failing that u may have a controller on ur steering wheel & u will need to do a similar thing but using the up & down buttons on that.

Stephen is right and l have some more point's
Ta!