I just bought a TH F6A a week ago, and learning to program it from the key pad and I do have the software but for the small amount of channels I need I want to put them in manually.
As far as the memory channels go, I have overwritten many trying to learn to do it... I put it in VFO mode, I then select the Band I want with the Band Key... I then press ENTER and it gives me a row of blank lines to punch in my frequency numbers on, so I enter my numbers, for example 146.760 for my local repeater. I then press TONE until I see the T displayed , then I press Function then TONE and the tones show up and I select the CTCSS tone I need and I press the MNU which is also an ENTER button to confirm that CTCSS Tone. I select the shift as "minus" - I have it set to Auto offset so I just double check the offset, then I test it to make sure it is working, then I press FUNCTION button and a number blinks in the window, if I have something in memory 10 lets say, normally I would advance the knob to # 11 and press MR and it would ut the frequency into memory channel 11, but if I set it on 10 where I have an unwanted freq then I press MR it will put it there usually. Thats the hard way....
Now for the easy way as the manual has it. Select your memory channel. Turn the radio OFF... press and HOLD DOWN the MR button and turn the power ON, it will ask if you want to delete that channel, simply press MR key and it will delete that memory for you...
I hope that helps you.... I also agree that this TH F6A is not all that the reviews say it is. I put a new JTH2 triband antenna on mine, as it got almost all 5 stars on reviews, and I own 6 Chinese hand helds and I tried to bring up a local 2 meter repeater and could not. I then took one of the Chinese hand held radios hit the PTT on the same channel and it comes right up full signal and the Kenwood sitting right next to it didnt even light up or hear that repeater until I picked it up and waved it in the air. The Chinese "Puxing" radio heard it and keyed it up anywhere I set it on my table. So I then put the JTH2 triband antenna I bought onto my Wouxun KG UV6X dual band hand held, and almost same situation but it did bring up the repeater however very very noisy so partly it's the JTH2 antenna but I'm not convinced this TH 6A is all the rave that people give it. I can't call it junk, but if I had known it was already a 12 year old radio, it came out 12 years ago I would not have bought it. Todays technology is way far ahead of what it was 12 years ago. Yes the radio works, and works well, however not as well as an $88 dollar Chinese radio. I'm not sure I'm going to keep mine, it's a week old, and has a spare 2000 mah battery and a Jetstream tri band antenna but it was on sale for $275 so it was a good price, they used to sell them for $469 back in the day when they came out 12 years ago.