Using alter command!!
www.w3schools.com/.../sql_foreignkey.asp

 table1 

 table 2

based on the above two tables tabel1 & table 2 ,I want claim id is foreign key in the table 2 ? what is the syntax ?

Did you check the link I provided in the above comment?

ALTER TABLE table2
ADD FOREIGN KEY (Claim ID) REFERENCES table1(id);

yea I checked bro ,& use different types of commends but not get my problem, error coming

Error

SQL query: Copy

ALTER TABLE LMS_Aprrovals
ADD FOREIGN KEY (Claim ID) REFERENCES lmscustomerdetails(id);

MySQL said: 

#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'ID) REFERENCES lmscustomerdetails(id)' at line 2

when i use

ALTER TABLE LMS_Aprrovals
ADD FOREIGN KEY (Claim ID) REFERENCES lmscustomerdetails(id);

this error gets

Error

SQL query: Copy

ALTER TABLE LMS_Aprrovals
ADD FOREIGN KEY (Claim ID) REFERENCES lmscustomerdetails(id);

MySQL said: 

#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'ID) REFERENCES lmscustomerdetails(id)' at line 2

this is third try

Error

SQL query: Copy

ALTER TABLE LMS_Aprrovals
ADD CONSTRAINT my_fk_type,
ADD FOREIGN KEY (Claim ID) REFERENCES lmscustomerdetails(id);

MySQL said: 

#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '
ADD FOREIGN KEY (Claim ID) REFERENCES lmscustomerdetails(id)' at line 2

Try removing the space between Claim and ID in your column name by renaming the column name of 2nd table and try again with same syntax to add foreign key.