Alright, I'll lead you through this process

k and i have just recived 3k

Alright. I'll set up a post to lead you through buying a new tab in a sec

Now, this example tab is a different price than the one you're trying to buy as the price increases each time.

So see the little thing that says "Purchase Tab"? Click on it. Once you do, a pop-up will appear and it reads "Please confirm the purchase of this Stable Tab.
Stable ID (insert ID here), Tab (insert new tab's number)
Cost: 480,000 (your number will likely be different)"
If the number is in green, you have enough gold to buy it. If it is in red, follow the next step.

Take the cost of the new tab and subtract from it the amount of gold you currently have. That will then tell you how much more you need to purchase the new tab.

I just looked at your hatchery. You have only 1 page not full yet. Wanted to let you know that when it does get full it will open a second page for you for free. I have seen some hatcheries with 9 pages full. I don't know if they are all free or not but I know at least the first 2 are free.

I think what she means is that she wants to have room for them when they grow up. All the hatchery tabs are free but they will not keep your pets when they grow up so it's good to either sell them or buy more tabs before that happens. Trust me @cars3fan, I know what you're going through. This is why I am currently doing my own mass sale.

Aaaaaaand she's gone

I was letting Cars3fan know that she will not run out of room in her hatchery so she can breed like crazy and sell the eggs like you suggested to her. I think she needs to save up between 20,000 - 40,000 gold to buy the next tab in her stable.

The best way to get gold and save it up is to take one of your pets or buy one for real cheap that is leveled up some and keep them doing missions for you while your main part keeps doing its thing. That is what I do with mine. I have some cheap pets for sale in my sale stable for 50gold each and the are levels 25 - 35 already..