X widgets need a paid plan. Hashtag widgets come with the Pro and Developer plans. Every paid plan starts with a 14-day free trial. See the pricing page.
1
Start a new X widget
If this is your first widget, click Choose A Service on your dashboard. Select Twitter, then a layout: Grid, Board, Slideshow, Scrolling or Feed.If you already have widgets, click New Widget and select the layout under Social feeds. In step 2, select your X account, or click Connect New Account, then X / Twitter. Then click Create Widget, and go to Set the hashtag.
2
Connect your X account
Click Connect in the Connected Account box. Sign in to X in the window that opens and allow SnapWidget to read posts. The widget uses your account to search X, so you need an X account even to show posts from other people.
3
Set the hashtag
In Filter, select Hashtag Only. Type the hashtag in Hashtag without the 
To show only your own posts that use the hashtag, select User and Hashtag instead.
# sign. The preview shows the posts.
4
Get your code
Change the other settings on the Basic tab. Then click Install Widget. In the Install Widget window, click Copy Code. Paste the code into your website.