Action Details
Requirements and how-to articles for Twitter's action:

Requirements
You need this to get it done:

Trend
A Trend to promote.
Can contain letters and numbers. Punctuation, symbols and spaces cannot be used.
Avoid excessive capitalisation.
Maximum of ~20 characters (since not every character is the same width, the actual character limit may vary slightly.)
Twitter Ads Account
A Twitter Ads account is required in order to create a Promoted Trend.
Payment
Promoted Trends currently cost $200,000 (USD) per day.
Target Location
Choose the location (e.g. country/city) you wish to target.
Tweet
A Promoted Tweet which is displayed at the top of the page when a user clicks on the Promoted Trend.
Requirements missing or found errors? Report

How-To Articles
A list of useful links for you:

0
Twitter Business - What are Promoted Trends?
Official information on Promoted Trends.
Official
0
Twitter Business - Promoted Trends guidelines
Official editorial and content guidelines for Promoted Trends on Twitter.
Official
Link missing here or found errors? Improve How-Tos