If you see "Allowed memory size exhausted" errors:
Method 1: wp-config.php
Add before "That is all, stop editing!":
```php
define(WP_MEMORY_LIMIT, 256M);
define(WP_MAX_MEMORY_LIMIT, 512M);
```
Method 2: .htaccess
Add:
```
php_value memory_limit 256M
```
Method 3: php.ini or .user.ini
Create .user.ini in root folder:
```
memory_limit = 256M
```
Method 4: Plesk PHP Settings
1. Go to Websites & Domains
2. Click PHP Settings
3. Find memory_limit
4. Set to 256M or higher
5. Click Apply
Note: Your hosting plan has maximum limits. If you need more memory than your plan allows, consider upgrading.