You must be using the Twitch application and you can get this from https://app.twitch.tv/download

Looking for a modpack in Twitch App? Have you just released a modpack and want to make sure it's popping up in the app? No problem, it's easy! This article is a general tutorial on how to find and install a modpack in the Twitch App, but remember that CurseForge was created for Authors, so some terminology can be targeted to those users.

With the Twitch Desktop open, click on the "mods" heading.

Since the Twitch App supports mods for many game types now, you need to click the Minecraft category icon next to it

Now you need to choose the second tab on the left. In English it is called "Browse All Modpacks" 

Because of a bug in TwitchApp, nothing will be listed by default and the message at the bottom will flash at an insane speed.

In the search box, type " World of Dragons "

Then click the "World of Dragons" icon to install the package. 

Once the package is installed, click it to play. If this is the first time you have installed any Minecraft package via TwitchApp, when the launcher appears, close it and click the package icon again, this second time will install the Forge code that actually allows the package to run. From here, any packages you install will work directly from the box.