Let me give you a little example:
SEO friendly URL should be like this, www.yoursite.com/menu/category/subcategory
Not SEO friendly is like this, www.yoursite.com/weroi&=number1/
Internal linking is the proper linking of pages within a site. It is one of the most important onpage SEO factors. It gives positive impact to the site.
I'd rather do forum posting than article submission. Article submission, directory submission and social bookmarking doesnt work anymore like they used to.
If you already set a signature on your profile settings, it will get activated once you reached a certain number of posts. You need more posts here on forum, more engaging and valuable.
Replace or the best thing to do is to delete the existing ones and start building a new content that is high quality and valuable. And as much as possible avoid creating it. Most especially, do not write content that is specifically for search engines but most importantly focused on your target...
Install Yoast plugin on your wordpress site, there you can add title and descrition tag, not only on your wordpress pages but also on your social media posts.