Hi Jennifer, are you saying it has become difficult to close lately compared to when you got the machine? If so that shouldn't be the case. Check your seal like the girls said, but also check your bowl and make sure you haven't damaged the rim
Let us know how you get on, otherwise contact your consultant and get them to have a look at it for you. Generally it should become easier to use as you (a) get used to it and (b) wear it all in a little.