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Set your default key on OS X 10.9

Let's say that you created more then one key pair. From now on, you would like to use the key with the id 00X00Y07 as your new default key.

Open up Terminal (Application»Utilities»Terminal)
```
mdfind gpg.conf
```
You should see two file path as an output. Now let's ignore the path for Thunderbird because we can use a gui setting as well if we like to change it. Copy the file path and type
```
open -a TextEdit yourfilepath
```
Replace the previous id with your new default e.g. “default-key 00X00Y07” and save the file
Come back to the Terminal and test your setting by signing a document