How do I delete routes?

As a 70 year old entering the new modern world of GPS I have just purchased a TomTom ONE V3.

I spent yesterday planning routes and I now want to delete them. I can't find out how to do this and we have no grandchildren around us to show me how.

I'm also struggling to plan routes using "via". It's a great device but poor instructions let it down.

Any help?

Your previous destinations will be overwritten one at a time, when you reach 24, when the oldest will 'fall off' the bottom.

If you want to do more than one via you have to use the Itinerary function.

[quote=Border_Collie]Your previous destinations will be overwritten one at a time, when you reach 24, when the oldest will 'fall off' the bottom.

If you want to do more than one via you have to use the Itinerary function.[/QUOTE============================================= =

Does that apply to the V3 model as going through the options I did find "Delete all routes" I deleted them, then added more but I can't find the "Delete all Routes" again.
It took me 10 years to master the VHS recorder!

I hate that function of the 24 rule. Such a pain.