Here's some sample microcopy for a submission form:

Title/Subject Line: Submit Your Content

Headline: Share Your Ideas with Us

We want to hear what you have to say! Share your thoughts, insights and creative content with us by submitting it below. We welcome all types of content: articles, photos, videos, podcasts, and more. Please include as much detail as possible so we can feature your content accurately. Don't be shy - we're excited to see what you'll share with us!