how to modify file size for uploading?

Hi,

I'm on ComicPress theme and wanna modify the size of files I gonna upload, to have them bigger.

I followed few tutorials for doing that but without any success. In particular:

1)

I copypasted the script below on the functions.php file and uploaded it but it didn't work:

Code:

---

@ini_set( 'upload_max_size' , '25M' );
@ini_set( 'post_max_size', '25M');
@ini_set( 'max_execution_time', '300' );

---

2)

I installed FileZilla client and connected to my website; I created a php.ini with the following script:

Code:

---

upload_max_filesize = 64M
post_max_size = 64M
max_execution_time = 300

---

and copypasted it on the root folder into the remote site (on FileZilla client), that's to say in the folder / .


None of the methods below worked.

How should I do for uploading bigger images?

Thanks.