Thank you very much Griff Grof - Following your instructions we still couldn't get the option to 'add to watch list' - but then realised non of the TB's have been placed in a cache yet - the cachers who retrieved them at the Essex Mega are still taking them all over the place!
We tried looking at a TB we placed near Long Compton yesterday and got the 'add to watch list' option - so have concluded they need to be in a cache before you can watch them! So, I think we will have to wait till the TB's we took to the Essex Mega have been put in a cache before we can put them on a 'watch list'.
In a couple of weeks we will be giving some TB's to our 3 Grandchildren for them to place in caches when we take them to Salcey Forest geo-caching, and really wanted to get the hang of the system before then!
Thanks once again for your help and quick reply. Jenny