Possibility to cancel item offers in the trade system

I just started selling some of my gold for coins, but after putting up 5 offers the website told me I could only have 5 trades open at the same time. It seems impossible to cancel any of my current offers, which is very annoying, since I want to sell more gold (aka stacks of 50 000 gold instead of 5000 gold) but all my current offers/trades last 5 days (because I thought you could just cancel offers at any given time). I could also not find any information about this in the FAQ or any other forum thread. If there is any information about this, please link/copy it to me. I would like to suggest a way to cancel offers through the trading (item) system however.

Kind regards

This probably only happens to 0,2 users per week and its no gamebraking issue. DEV is to busy with more important things (i hope).