Is there a recommended size for the canvas?

Hi there,

We need to change the gallery and wallpaper images use for the canvas.

- Registration form:
Where to go to change the image and the text in the canvas of the registration form?
beautyontrial.deligencetechnologies.com/index.php ?
What the size of the image by default?
option=com_comprofiler&view=registers&I beautyontrial.deligencetechnologies.com/index.php?option=com_comprofiler&view=registers&Itemid=342 temid=342

- Profile page:
2 sizes (700x200 and 350x100) are used in the gallery for each banner.
Should any new canvas added to this folder be available in the 2 sizes?

Registration canvas can be selected within CB > Configuration > Registration by adjusting "Registration Title Image". Place new images for this parameter in your Joomla images folder. Recommended height is 150-200px and width is whatever the maximum width of the content pane is for your template. 700x200 should be fine typically.

Should any new canvas added to this folder be available in the 2 sizes?

When uploading a canvas it automatically creates the full size and thumbnail based off the image size parameters for the canvas field or global sizes. If you mean for the gallery then yes you'll want to typically supply a full size and thumbnail.