How to access the library from Blockchain inside the smart contract?

				
					// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

library ArrayLib {
    function find(uint[] storage arr, uint x) external view returns(uint i) {
        for (i; i <= arr.length; i++) {
            if (arr[i] == x) {
                return i;
            }

        }
    }

    function insert(uint[] storage arr, uint num) external returns(uint[] memory){
        arr.push(num);
        return arr;
    }
}

contract CodiesAlert {
    uint[] public arr = [1,2,3,4];

    function getIndex() public view returns(uint) {
        return ArrayLib.find(arr, 4);
    }

    function insertNum() public returns(uint[] memory) {
        return ArrayLib.insert(arr, 4);
    }

    function returnUpdatedArray() public view returns(uint[] memory) {
        return arr;
    }

    function returnLibAddr() public view returns(address) {
        return address(ArrayLib);
    }

     function returnContractAddr() public view returns(address) {
        return address(this);
    }
}