First of all a huge thanks to Scorching_Kami for making this amazing Dragon's Kindom Mod.
The server I play on is called: ASTRA House of Dragons UK [PVP]
Now to the taming.
Have mutton and a tamed high level ovis with a lot of points in health with you before going out and look for a wild zaldrir.
When you find one wait for it to land and go to sleep. Have your Ovis placed infront of the Zaldrir. Walk up to it and infront it and feed it the mutton. Back off and stay at the side or behind it. So you do not get roasted aswell when the zaldrir prepares its meal. Wait till you see the taming go to 50%. Now you can walk to it and jump on it. At the bottom there will be a red bar. You need to fill that bar with 'worthy prey' before the timer at the top right runs out. Unworthy prey will not increase your taming progress nor will it decrease it, so when you do kill an unworthy prey no worries. So try to kill big dinos like Steggo and bigger and Carno and bigger even other Zaldrir.