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If you are coming from WeakAuras 1, just delete 1, install 2 and you are ready to go. All your auras will be there. You can do this manually or via Curse Client.

WeakAuras is a powerful and flexible framework that allows you to display highly customizable graphics on your screen to indicate buffs, debuffs, and a whole host of similar types of information. It was originally meant to be a lightweight replacement for Power Auras, but it now incorporates many features that Power Auras does not, while still remaining more efficient and easy to use.

Features include:

An intuitive and powerful configuration interface
Custom textures including all textures from Power Auras and the new Cataclysm spell alerts
Progress bars and textures that show the exact duration of auras
Displays based on auras, health, power (mana, rage, soul shards, holy power, etc.), cooldowns, combat events, runes, totems, items, and many other triggers
Preset and user-defined animations
Custom side-effects such as chat announcements or sounds
Grouping, which allows multiple displays to be positioned and configured at the same time
CPU optimizations such as conditional loading/unloading of displays, modularity, and prevention of full aura scanning
Powerful customization options, such as animation paths, on-show/on-hide code, and custom triggers, for Lua-savvy users.

To open the options window, type "/wa" or "/weakauras" (if this isn't working, update weakauras 2 again manually or with curse client. This should solve the problem.)

WALKTROUGH GUIDE

I'm far from a pro with weakauras 2 but i use it alot. How i get my WA? The easiest way is to google what you want, search for a string with good comments and copy the whole string. Take this string for Highmaul encounters, you have to copy the RAW Paste Data! http://pastebin.com/SyubDvrc

After you copied the string, go back ingame, open weakauras with /wa or /weakauras and a window will pop up. On the bottom of that window you will see an icon with 'Import'.
Click on that and another window pops up. Paste your string in there and press 'done' on the bottom right.
Now you prolly see a small window on the bottom middle of your screen with the weakaura(s) you want to add and how it's called. Press import on that little window and it adds it to your weakaura list. You can change the name at that point if you want or just press enter to leave it as it is.

This is rly easy and shouldn't be a problem for anyone. Ifyou still have a porblem with this, ask me ingame or reply here and i'll try to catch you online asap.

Good luck and cya all!