Installing TGPX today

[Vivaldi]

I'm not used to writing tutorials but here it goes ... do a gallery search of Your galleries. Let's say criteria is a certain sponsor and picture galleries only. in my case I have sponsors listed as sponsor-site-name (like ND-milfhunter)
so ... I would choose
Sponsor: ND-milfhunter
Format: pictures
and do a Search!
You've got a list of galleries now. Whenever You try to change anything, in case of the picture I've added e-mail address, You'll always get 4 basic options. The third one is mass change and it refers to Your current change, in my case e-mail address. So, when I hit it I will change all e-mail addresses at the galleries that came out from my search criteria (Sponsor: ND-milfhunter, Format: pictures).
You can do the same with Categories. Be careful cause once You hit change button there is no coming back. Best option is to play it safe and narrow Your search as much as You can before You make a change. I have had a problem with it. At first I have manually changed cats for some of my galleries (added few galleries to 4 categories) but then did a search and did a mass change for some sponsor galleries and whipped out the previous work since those galleries with 4 cats matched search criteria.
Remember, if the organization of the galleries and cats is ok narrow Your search to minimize Your possible error damage :-) and don't say I didn't told You!
Oh ... and this is the only way I know of 'mass change' ... hope it helps.