Hi all - I'm asking here because I can't find an answer on eBay help... 

I recently sold an item with free shipping, but when I found a box suitable for packing it I found it was larger dimentions than the RM Simple Delivery 'up to 2kg' option that eBay had pre-selected for me. 

I'm happy to pay for the larger size but I can't figure out a way to do this - all I get is a shipping label ready to print already in my inbox, with no option that I can see to change weight and dimentions and pay a bit more

Do I now need to pre-find a box and weight when creating the listing, or am I being a bit dense? 

As someone who's sold around 400 items over the years but hasn't been using the site for maybe 12 months, I'm HATING the changes! Might even just give up...