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Select a picture that you want to use for your avatar and resize it to 150 by 150 pixels and then upload it:
Go to your User CP and you will see the text below:
Use Custom Avatar
You may upload a new custom image using the controls below. Either enter the URL to the image you wish to use, or use the upload control to upload an image directly from your own computer.
Enter Avatar URL:
Upload an Avatar From Your Computer:
Note: The maximum size of your custom image is 150 by 150 pixels or 24.4 KB (whichever is smaller).
If memory services me correctly, I think 150 X 150 pixels is the max allowed for avatars. Your current avatar is already at the max widthwise at 70 X 150 pixels. Anyway the Help Forum is the place you need to go for all your general Forum help and "how to" questions. Post this in the Help Forum and one of the moderators there should be able to answer your questions and provide you with help as needed. Good luck.