Login to your MCPE Index account, click Add Server and paste the IP into the field asking for the IP and then copy the port which you forwarded before (default is 19132) into the port field.
A hatcling is any animal that is newborn from a hard shell. Turtles are born from a hard shell cover. Thus, it should be called a hatchling. A hatchling is the newborn of animals that develop and emerge from within hard-shell eggs. The offspring of birds and reptiles are often hatched naked and with their eyes closed.
At a minimum, a single baby or juvenile painted turtle should be provided about 10 gallons of water volume. This does not mean a 10-gallon tank, but at least a 15- or 20-gallon tank partially filled with 10 gallons of water. Increase the volume of water by 5 gallons for each additional baby turtle.