Here are the steps to load a Level 2 Landsat image in ENVI software:
Open ENVI software.
Go to File -> Open Image File.
In the "Open Image File" dialog box, navigate to the directory where your Level 2 Landsat image is stored.
Select the file format of your image (e.g., GeoTIFF, HDF) from the "Files of type" drop-down menu.
Select the Level 2 Landsat image file you want to open.
Click on the "Open" button.
ENVI will then load your Level 2 Landsat image. If the image has multiple bands, each band will be displayed as a separate layer in ENVI's Layer Manager. You can also use ENVI's tools and functions to analyze and process your image data.