how to get texture for my website?

By TEXTURE I assume you mean a background image or pattern of some kind?

If so, search for backgrounds on Adobe Stock.

Deployment depends entirely on which web authoring solution you use and whether or not it supports direct input of CSS code.  See link below.

https://www.w3schools.com/css/css_background.asp

Please post the exact name of the Adobe program you use so a Moderator may move this message to that forum