Hi there, please help!

I recently purchased this fab plug as i was gob-smacked with the free version and how easy it was to get a classy gallery purring away in an article with no more than a file upload and half a line of simple code, v.nice indeed.  The only function lacking off the free version for me was the ability to resize the pop up images, so when i read that this was a feature of the Pro version, along with a plethora of other great features, the 12 euros was, as they say, a no-brainer but my joy has turned to sadness as I'm stuck on a couple of issues that I'm hoping you kind folks can help me sort so i can get this love affair back on track!

1.(How to) Resize Popup Image
I have read that this question has been "solved" elsewhere on this forum but for love nor money I can not find the post/s where this is explained - i really need this and it is why i bough the product.  Cant find anything in the documentation either unless i am being super daft - I am willing to be classed as daft if someone shows me where i missed it?

2. My thumbs are all squished together...
The free version had the thumbs beautifully spread out across the article , spaced out evenly as per the exmaples on the joomlaworks site, but after install of pro all thumbs are butted up together, like with no spave between them at all - really don't know where to start on this one so all advice would be defo appreciated.

FYI, i uninstalled the free version before installing Pro.

Hopefully i can hold off on issues 3 if the forum can help?

thank you, jak