Hi! There are a couple of things you’ll want to adjust in the web font settings you currently have to get that font to work, the first being taking out the extra stuff that’s been pasted along with the font URL as mentioned by MattRoberts and nkrisc. When you copy the URL from Google fonts, you’ll want to copy just the URL captured between the quotation marks:
For that particular font it also looks like Google Fonts wants you to write out the font family as “M PLUS Rounded 1c” when you specify the web font, as specified in the “Specify in CSS” portion of the font info dialog. For your font, it looks like when the font is locally installed in Axure RP it renders the font name as “Rounded Mplus 1c”; in testing it looks like you can get the font to render in the browser if you use the URL above and then add a Font Mapping setting that maps “Rounded Mplus 1c” to “M PLUS Rounded 1c”. Hopefully that does the trick!
Web font sample.rp (42.7 KB)