The procedure in the manual for saving memory channel seems pretty clear as long as you follow each step exactly. Basically, the steps are set the frequency in VFO mode, select the memory channel that you want to save to, then save the channel.
Where things seem to get more difficult is selecting repeater offsets and tones. What doesn't help is that the Basic Manual makes no mention of repeaters or offsets and little mention of PL tones. You have to dig into the Advanced Manual that that information. Page 4-2 and 4-4 talk about repeater settings and send you to page 5-3 to set the tone and page 5-4 to set the repeater offset. If "Auto Repeater" is turned on, that should automatically select the offset.
Setting the tone seems to present even more challenges. There's a Set Mode setting called "tOne" that seems to select between CTCSS (aka PL) and DTCS (aka DPL). Then, there's a setting called "R tOne" that seems to set the transmit tone and an other setting called "C tOne" that sets the receive tone (which you should not need to use an amateur radio repeater).
