Select the “Settings” icon from the top right after signing in to your account, and then choose your blog from the left pane.
Click “Edit HTML” in the Customize pane and then press “Ctrl-F” to access the search function.
Type “{block:Photo}” into the search box and then press “Enter” until you locate code that resembles the following:
{block:Photo} {LinkOpenTag}{LinkCloseTag}
Replace “{PhotoURL-500}” with “{PhotoURL-HighRes}” (without quotation marks).
Click “Update Preview” and then click “Save” to enable high-resolution photos in your theme.
Click the back arrow and then click “Exit” to return to the previous page.
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