I have a website http://www.brideswardrobe.com,really want to know how to increase my PR?

it's ranking will improve by search engine optimization and moreover through advertisement of website

Google search technique is mainly content based. Thus articles with good content comes under the Google scanner, it helps to increase the page rank. So while writing articles key should be the quality of the writing with proper usage of keywords, providing the link of your page and use of words that is simple, understandable and clear.
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Links-builder.com