Why can I only see click & collect options and not post?

You must have requested for your account to be a Click & collect account only so this means you will not be able to see the postal products once you log in. You can see them before you login but if you add them to your basket then checkout it will put postal products into your click & collect account and they won't be able to be posted, nor will you be able to pick them up. 

Please use the click & collect form 

https://www.theyloveit.co.uk/collection.html to change your account to a Click & Collect AND Post account and then you will be able to choose.