I think if you don't provide more info about "doesn't work", no-one will be able to help you. Perhaps not even then, as BlipCentral appear to be completely AWOL now and don't reply to support requests.
Why does extra photo addition not work on my IPad
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I don't have the option on my iPhone either. At least I haven't found it yet.
If you hold the plus sign until it acts like you are trying to copy it, you should get a menu that will let you add an extra. This will work for one extra. You need to save and then come back with edit to add another one the same way.
If you don't see the plus when you first do your entry, try saving and then editing it. That should work.