You can embed a streetview image by selecting the three dots at the top right and going from there. I'm not sure it will do a tour - you will have to try it.
Anyway, from the 3 dots, select 'share or embed image', then 'embed a map' and then 'copy html'. That puts code into the clipboard.
Back into WWB and put HTML onto your page (standard -> HTML). Double click to add the html code, resize the box and test it out.