If your website/product is built on bubble, SEO is teh first thing you should add on the page. Why?
Organic search results cover more digital real estate, appear more credible to searchers, and receive way more clicks than paid advertisements. For example, of all searches, only ~20% of people click on paid advertisements.
SEO is also one of the only online marketing channels that, when set up correctly, can continue to pay dividends over time, ie it compounds and can reward us greatfully. If you provide a solid piece of content that deserves to rank for the right keywords, your traffic can grow over time, whereas advertising needs continuous funding to send traffic to your site. (which in long term is not sustainable)
So it's esstential to have SEO setup from the start itslef. In the long term, it will work.
How to add it on a page?
Step 1- Select the page you need to add the Title and description
Step 2- Double click on the page background and you'll get the above tool box
Step 3- Change the SEO Title and description, you can add image for Facebook too.
These SEO changes will help you crawl in the search index and will help you in the long term as well. Make sure you research well and add the title and description according to the research of the searches people do.