“Delay this marriage for a month, a week, or if you do not, make the bridal bed in that dim monument where Tybalt lies.”
Juliet wants this marriage with Paris delayed and if lady capulet and old Capulet (her parents) do not do that for her she wants to go into the family monument so basically kill herself.
“I’ll to the friar to know his remedy if all else fail, myself have the power to die.”
Juliet wants to go meet Romeo at Friar Lawrence to figure ou the plan and if the plan doesn’t work she will kill herself.