custom portfolio link and custom row size

Hello!

I´ve just posted that 2 issues before, but nobody responds…

1. My Custom portfolio link is not opening in a new tab. I would like that works.
2. I´m trying to set a row in 5 colums: 1/5 + 1/5 + 1/5 + 1/5 + 1/5 but I´m getting ” format error”. What´s the reason?

Thanks so much for your help.

Kind regards,

Inma