Dear Alejandra,
regarding the 2×1 portfolio tag tile: you cannot make it go away with CSS, since it has a wrapping div which only has a class and no unique ID. To remove the tile, please download this custom file I’ve made for you, unzip it, and upload into the theme folder (/wp-content/themes/Ikebana), replacing the existing file.
Concerning the icon menu links: I can now see that the page http://fx2.com.uy/site/tag-portfolio/portfolio/ exists – have you resolved this issue?
Sincerely,
Andrew / Satori Studio