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Click the File and select Append. Double-click a Blender file. Double-click the Object folder. Select all objects and click Append. Press H to hide objects in your scene. Delete objects you don't want.
The File menu is at the top-left corner. A file browser will expand. Blender files have a .blend file extension at the end. This displays numerous folders for the Blender file.The Minecraft BSS edit ZIP file contained numerous Minecraft related Blender files, including characters, structures, mobs, and items. This displays all objects in the Blender file. To select all objects, click the first object in the list and then scroll down to the bottom of the list. Hold the ⇧ Shift key and click the last object to select everything. Clicking Append imports the selected objects into your scene. Many objects have lots of boxes and planes that serve a function but don't need to be visible in a scene. To hide objects you don't want to appear, click to select them and then press "H" to hide them.  To unhide an object, click the eyeball icon next to the object name in the "View Layer" panel in the upper-right corner.  Warning: You'll notice wireframes above character rigs that resemble a control panel, as well as around moveable parts of the rig.  Do not hide these.  You will need them to animate the rig. Many of the blender files contain multiple objects.  For example, the mobs Blender file has a rig for every Minecraft mob.  You probably don't want to use every single mob in your animation.  You can delete rigs you don't want by selecting them and pressing the Del key.  Just be careful not to delete any part of a rig you do want to use.