In order to start the process to connect your external wallet, be sure to download the app of the external wallet of your choice on your device.

Navigate to the “Menu” icon located at the bottom right corner of the screen and click on it.
Click on the displayed current value of your assets.

Click on “Continue” on your wallet page and select the wallet you want to connect.
 
You will be redirected to the external wallet you have downloaded to click on, follow the procedure on the external wallet app.

Once done, go back to your Linework wallet. Your external wallet has been connected.